Electron-discharge device



Feb. 1,1921. V. L. RONCI ELECTRON mscmmea DEVICE Filed Feb. 21 192s five/#0 Marl/P0061,

Patented Feb. 1, 1927.. UNITED STATES vroron L. RONCI, or BROOKLYN, NEW YORK, nsszenon, BY mnsnn ASSIGNMENTS, nnnorarc COMPANY, INCORPORATED, a oonrona'rron or NEW TO WESTERN vonx.

1. 6.1 9. PATENT, oar-Ice.

ELECTRON-DISCHARGE DEVICE.

Application filed February 21. 1925. Serial no; 10,753 i This invention relates to electron discharge devlces and has for an ob ect an 1111- proved supporting structure for one of the electrodes, which is capable of withstanding high voltages.

This object is attained in a device of this character, by providing a highlyrefractory wire nest comprising two parallel helices of large diameter with smaller diameter turns at each end thereof. The smaller turns of each helix are interwoven to accommodate a supporting rod which is fused tov one of the turns. .A cylindrical insulating insert having an undercutportion is seated in each large helix and carries a metallic hook for the suspension of the cathode. This ar-- rangement provides an. easily formed structure for the cathode support in which the curved surfacespf the nests prevent the high voltages forming 'an arcingpath from the anode. I Referring to the drawings Fig. 1 is an electron discharge device with a part broken away to illustrate the invention. r

vFig. 2 is an enlarged perspective view of the electrodesupport made in accordance with this invention.

Fig. 3 isan end view of assembly, and

Fig. 5 illustrates a winding tool for forming the wire nests. I

The electrondischarge device comprises an enclosing 'vessel having a glass portion 10, and a. cup-shaped metal anode portion 11. A- helical .wire grid 12 is. coaxially supported within the vessel in a. well-known manner. Centrally arranged within. the grid 12 and the anode 11 is the supporting rod 13, preferably of highlyrefractory material, such as molybdenum. The supporting rod 13 is provided with an undercut portion 14 atone end to receive the small turns of the wire nests 15 and 16. A shoulderl'? on the rod acts as a positioning'means for I p the nests.

The nests 15 and 16 are preferably formed of highly refractory .wire,'such as molybdenum, and consist of closely wound helices of large diameter, each of the nests bein wound in an o posite direction with respec to the other. ne or more turns at the ends of each helix may'be provided with a flattened portion 18 to provide holding means 7 the support. I Fig. 4 shows the individual nests before tened' portion 18 on the other end of for the insulating inserts, to be.hereinafter' described. Flattene dportions 18 are ;ar-

ranged on opposite surfaces of'thehelix to distribute the pressure on the insulating insert. Integral with each helix and at opposite ends thereof are one or more turns 19 and 20 of small diaineteni These turns are arrangedflwith their axes parallel with the with each other. I

- Thenests 1'5 and 16 are arrangedin' parallel relation with. their smaller turns interwoven to provide a passage for .the undercut portion 14 of-therod 13. The end 210i the rod projecting above the small turns 20 axis of the large helix and are in alignment thereof, thereby forming a button 22. The. fusing operation melts the end of .the rod and a rigid connection between the turns-20 and the rod is secured. A cylindrical insulating insert'23, composed of",1avite or -.'alun'dum is provided: with an undercut zportion24 at each ndan'd on opposite sur v faces of the insert. In assembling the in 'sert in the large helix, the turn having the flattened portion 18 is sprung, to allow the passage of the insert through the helix. When the projection 25-reaches the other flattened portion 18, the insert is securely clamped, in the helix, since the first fiatdrel, such as" is shown in Fig. 5. This tool 100 comprises a head 28, which may be inserted in the chuck of a. lathe." One end of the head is provided with apertures 29 and 30, for the insertion of different -size pins.

relatively short pin is inserted'in the-aper- 105 ture 29- and along pin of the desired diamete'rfor the small turns of the helix, is inserted ii -the central aperture 30. The molyb-v denum wire is inserted inthe space between the two pins and thehead is rotated to make-110 6 is fused by drawing an are over the, tip

completeloop of themolybdenum wire.

This operation provides the small diameter turn 19. The central pin is removed and replaces the short pin in aperture 29. A larger diameter pin 31 is inserted in the central aperture 30 and is provided with undercut portions '32 and 33 atopposite ends of the pin and on opposite surfaces thereof.

-"The portion 32 is positioned adjacent. the pin vin aperture 29. The smalldiameter turn 19;

of the molybdenum Wire is placed on the pin ili'aperture 29. One or more turns are then .wound on the undercut portion 32. These turns are wound in'an opposite direction with respect to the small turn. A desired number of turns arethen wound on the cylindrical portion of the pin3l, to provide the major portion of the nest and a single turn is made over the undercut portion 33.

The short pin in the aperture 29 is removed and a long pin 34 is=,inserted through the small turn 19 and into the aperture 29.

One or more turns 20 are then Wound on the pin 34 in the same direction as the turn 19, and the completed nest is removed from the pins. The nest 16 is formed in like manner. This method provides an easily formed unit which may be interwoven to provide a complete metallic receptacle of highly refractory material for the support of the insulating inserts which carry the cathode.

Although the invention has been described I with respect to a particular arrangement,

it is understood that various modifications may he made in the construction, without departing from the, scope of they invention.

Furthermore, the "invention is not limited to highly refractory wire, since the nests may be formed of any metalin wire form, and is only to be limited within the scope Of tlIQ- appended claims.

v What is-claimd is:

' 1. An electrodesupport comprising a wire helix of large diameter, a. turn of small diameter at each end thereof and havingits axis parallel-to the axis of said large helix, an insulating member rigidly held on said helix, a supporting rod passing through said smaller turns, and an electrode supported from said member.

2. An electrode support comp-rising a'wire helix of large diameter, a'turn of smaller diameter at each end thereof and: having its axis parallel to the axis of said large helix, a cylindrical insulating insert Within said helix, meansat either end of said" a rod passhelix to clamp said insert therein, ing through said smaller turns and fastened thereto, a .hookrigidly -held in said insert and an electrode suspendedfrom said hook.

.3. An electrode support comprising a wire helix of large diameter, a-turn' of smaller trode supported from. said members.

diameter at each end thereof and having its axis parallel to the axis of said large helix, aninsulating member in said helix, retaining means on said helix to prevent movement of said member, a supporting rod passing through said turns and fused to one turn thereof, and a filament carried V by said insulating member.

4:. An electrode support comprising a wire helix of large diameter, a turn of smaller diameter at each end thereof and having its axis parallel to the axis of'said large helix, 7

an insulating member having an undercut portion, a flattened turn of said helix co' operating with said undercut portion to prevent movement of said member, a rod fastened tosaid helix, and a filament sup- 30 ported by said member.

5. An electrode support comprising a wire helix of large diameter, at least one of the turns of said helix having a flat portion,

an insulating insert within said helix, said 35 insert being retained therein by said fiat portion, a plurality of turns of smaller diameter projecting from either end of said helix, a supporting rod, said turns being in alignment to receive said rod, a metallic hook in said insert, and a filament supported from said hook.

6. An electrode support comprising par-.

allel wire helices of large diameter, each of said helices having a turn of small diameter 5 at each end thereof, said turns being intermediate the large helices and having a common axis, a rod passing through said turns, an insulating member in each of said members.

7. An electrode support comprising par-' allel wire helices of large diameter, each of said helices having a turn of small dihelices, and a filament supported by said ameter at'each end thereof, said turns bemg intermediate the large helices and interwoven to form sleeves, a rod passing through said sleeves, insulating members frictionally held in said helices, and an elec- .8. In an electron discharge device, an errclosing vessel comprising a glass portion and a metal portion, said metal portion con 7 in said nests, and means carried by said'in 'sert's forsuspending saidcathode therefrom; In witness whereof, Ihereunto subscribe my name this 16th day of February, A. D.

VICTOR L RONCI.

within said anode, a support therefor, said cylindrical insulating inserts 

